Question: "Calculate the standard deviation for the following set of numbers: 5, 8, 12, 15, 22, 26.
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What are the characteristics of the circle defined by the equation x^2 + y^2 = r^2? How does the radius r relate to the distance of any point (x, y) on the circle from the origin?
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What is the probability of getting exactly 3 heads in 5 coin flips, given that the probability of getting a head is 0.5?